The book *Mental Health Systems Compared: Great Britain, Norway, Canada, and the United States* edited by R. Paul Olson, published by Charles C Thomas in 2006, provides a comprehensive comparison of mental health systems in these four countries. The book consists of 7 chapters, each focusing on one country, and is structured into three main sections: description, evaluation, and recommendations. It includes 10 figures and 66 tables, offering detailed insights into service needs, population relevance, and system improvements. The authors highlight the complexities of mental health care systems and advocate for easily accessible, comprehensive information to facilitate decision-making and resource allocation. While the book is particularly useful for professionals in the mental health sector, it could be enhanced by regular updates to reflect evolving systems and broader cultural and developmental contexts.The book *Mental Health Systems Compared: Great Britain, Norway, Canada, and the United States* edited by R. Paul Olson, published by Charles C Thomas in 2006, provides a comprehensive comparison of mental health systems in these four countries. The book consists of 7 chapters, each focusing on one country, and is structured into three main sections: description, evaluation, and recommendations. It includes 10 figures and 66 tables, offering detailed insights into service needs, population relevance, and system improvements. The authors highlight the complexities of mental health care systems and advocate for easily accessible, comprehensive information to facilitate decision-making and resource allocation. While the book is particularly useful for professionals in the mental health sector, it could be enhanced by regular updates to reflect evolving systems and broader cultural and developmental contexts.